about 'Modal Popup window'

Question

I have a question regarding this article 'Modal Popup Dialog Window in ASP.NET' by Frederick Volking. There he introcuded an easy way to popup a modal child Web Form from the parent Web Form. I'd like to know if this can also apply to the UserControl? which mean, 'Can I call a popup modal child Web Form from a UserControl?' IF so, can anyone share the way to do it? Thank you for any advise.